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Pacific Banana Slug
Ariolimax columbianus
17,792 observations
Horned Nudibranch
Hermissenda crassicornis
9,109 observations
Black Slug
Arion ater
4,440 observations
Frilled Dogwinkle
Nucella lamellosa
3,798 observations
Pacific Sideband
Monadenia fidelis
3,527 observations
Monterey Dorid
Doris montereyensis
3,279 observations
Lewis's Moon Snail
Neverita lewisii
3,139 observations
Leopard Slug
Limax maximus
3,092 observations
Brown-lipped Snail
Cepaea nemoralis
3,069 observations
White-lined Dirona
Dirona albolineata
2,599 observations
Garden Snail
Cornu aspersum
2,386 observations
Lined Chiton
Tonicella lineata
2,001 observations
Mossy Chiton
Mopalia muscosa
2,001 observations
Nuttall's Cockle
Clinocardium nuttallii
1,718 observations
Northern Leopard Dorid
Diaulula odonoghuei
1,651 observations
barnacle-eating dorid
Onchidoris bilamellata
1,574 observations
Giant Nudibranch
Dendronotus iris
1,420 observations
Branched Dendronotid
Dendronotus venustus
1,362 observations
Oregon forestsnail
Allogona townsendiana
1,335 observations
Gumboot Chiton
Cryptochiton stelleri
1,232 observations
Woody Chiton
Mopalia lignosa
1,213 observations
Three-lined Aeolid
Orienthella trilineata
1,209 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,167 observations
Red Sponge Dorid
Rostanga pulchra
1,123 observations
Modest Clown Dorid
Triopha modesta
997 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
989 observations
Hooded Nudibranch
Melibe leonina
981 observations
Purple Mahogany Clam
Nuttallia obscurata
976 observations
Milky Slug
Deroceras reticulatum
967 observations
Striped Dogwinkle
Nucella ostrina
943 observations
Black Leather Chiton
Katharina tunicata
892 observations
Robust Lancetooth Snail
Haplotrema vancouverense
865 observations
Noble Dorid
Peltodoris nobilis
850 observations
East Pacific Red Octopus
Octopus rubescens
796 observations
Green Falsejingle
Pododesmus macrochisma
749 observations
Rough Keyhole Limpet
Diodora aspera
738 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
730 observations
Opalescent Inshore Squid
Doryteuthis opalescens
691 observations
Rough Piddock
Zirfaea pilsbryi
574 observations
Rocky Aeolid
Eubranchulus rupium
569 observations
Northwest Hesperian
Vespericola columbianus
563 observations
Striped Nudibranch
Armina californica
549 observations
Heath's Dorid
Geitodoris heathi
535 observations
Pacific Oyster
Magallana gigas
530 observations
Pacific Razor Clam
Siliqua patula
519 observations
Butter Clam
Saxidomus gigantea
511 observations
Festive Tritonid
Tritonia festiva
495 observations
Reticulate Taildropper
Prophysaon andersonii
489 observations
California Mussel
Mytilus californianus
461 observations
Cockerell's Dorid
Limacia cockerelli
445 observations
Frequently Asked Questions
- The 10 most common molluscs in Washington are:
- Pacific Banana Slug (Ariolimax columbianus)
- Horned Nudibranch (Hermissenda crassicornis)
- Black Slug (Arion ater)
- Frilled Dogwinkle (Nucella lamellosa)
- Pacific Sideband (Monadenia fidelis)
- Monterey Dorid (Doris montereyensis)
- Lewis's Moon Snail (Neverita lewisii)
- Leopard Slug (Limax maximus)
- Brown-lipped Snail (Cepaea nemoralis)
- White-lined Dirona (Dirona albolineata)
- The most observed mollusc in Washington is Pacific Banana Slug (Ariolimax columbianus), with 17,792 recorded observations.